package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.DishNotFoundException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Override
    public void save(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        if (dishDTO.getStatus() == null) {
            dish.setStatus(StatusConstant.DISABLE);
        }
        dishMapper.insert(dish);
        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> dishFlavors = dishDTO.getFlavors();
        if (dishFlavors != null && !dishFlavors.isEmpty()) {
            dishFlavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
        }
        dishFlavorMapper.insertBatch(dishFlavors);
    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> dishes = dishMapper.pageQuery(dishPageQueryDTO);
        if (dishes == null || dishes.getResult() == null || dishes.getResult().isEmpty()) {
            dishPageQueryDTO.setPage(1);
            dishes = dishMapper.pageQuery(dishPageQueryDTO);
        }
        // 没有任何菜品
        if (dishes == null || dishes.getResult() == null || dishes.getResult().isEmpty()) {
            throw new DishNotFoundException(MessageConstant.DISH_NOT_FOUND);
        }
        return new PageResult(dishes.getTotal(), dishes.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     * - 可以一次删除一个菜品，也可以批量删除菜品
     * - 起售中的菜品不能删除
     * - 被套餐关联的菜品不能删除
     * - 删除菜品后，关联的口味数据也需要删除掉
     */
    @Override
    public void deleteByIds(List<Long> ids) {
        List<Dish> dishList = dishMapper.selectByIds(ids);

        //判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for (Dish dish : dishList){
            if (Objects.equals(dish.getStatus(), StatusConstant.ENABLE)){
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否能够删除---是否被套餐关联了？？
        for (Long id : ids){
            if (setmealDishMapper.countByDishId(id) > 0){
                //当前菜品被套餐关联了，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
            }
        }

        //删除菜品表中的菜品数据
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    @Override
    public DishVO getById(Long id) {
        Dish dish = dishMapper.selectById(id);
        List<DishFlavor> dishFlavors = dishFlavorMapper.selectByDishId(id);

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    @Override
    public void update(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishIds(Collections.singletonList(dishDTO.getId()));

        List<DishFlavor> flavors = dishDTO.getFlavors();

        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }


    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }

    @Override
    public List<DishVO> getDishesByCategoryId(Integer categoryId) {
        DishPageQueryDTO dishPageQueryDTO = new DishPageQueryDTO();
        dishPageQueryDTO.setCategoryId(categoryId);
        // 查询启售的菜品
        dishPageQueryDTO.setStatus(StatusConstant.ENABLE);
        return dishMapper.pageQuery(dishPageQueryDTO);
    }

    @Override
    public List<DishVO> listWithFlavors(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        List<Dish> dishes = dishMapper.list(dish);

        List<DishVO> dishVOS = new ArrayList<>();
        for (Dish d : dishes){
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> dishFlavors = dishFlavorMapper.selectByDishId(d.getId());

            dishVO.setFlavors(dishFlavors);
            dishVOS.add(dishVO);
        }
        return dishVOS;
    }
}
